Initial commit
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Zhongwei Li
177
skills/dnd-dm/roll-dice.sh
Executable file
177
skills/dnd-dm/roll-dice.sh
Executable file
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#!/bin/bash
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# D&D Dice Roller CLI Tool
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# Usage: ./roll-dice.sh <dice-expression> [--label "description"] [--hidden]
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# Examples:
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# ./roll-dice.sh 1d20+3 --label "Perception check"
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# ./roll-dice.sh 2d6+2 --label "Goblin damage" --hidden
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# ./roll-dice.sh 1d20 --advantage --label "Attack with advantage"
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# ./roll-dice.sh 1d20 --disadvantage --label "Attack with disadvantage"
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# Colors for output
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RED='\033[0;31m'
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GREEN='\033[0;32m'
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YELLOW='\033[1;33m'
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BLUE='\033[0;34m'
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MAGENTA='\033[0;35m'
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CYAN='\033[0;36m'
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NC='\033[0m' # No Color
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# Parse arguments
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DICE_EXPR="$1"
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shift
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LABEL=""
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HIDDEN=false
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ADVANTAGE=false
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DISADVANTAGE=false
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while [[ $# -gt 0 ]]; do
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case $1 in
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--label)
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LABEL="$2"
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shift 2
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;;
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--hidden)
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HIDDEN=true
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shift
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;;
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--advantage)
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ADVANTAGE=true
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shift
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;;
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--disadvantage)
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DISADVANTAGE=true
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shift
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;;
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*)
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shift
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;;
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esac
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done
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# Function to roll a single die
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roll_die() {
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local sides=$1
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echo $((RANDOM % sides + 1))
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}
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# Function to parse and roll dice expression like "2d6+3" or "1d20"
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roll_dice_expr() {
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local expr=$1
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# Extract number of dice, die size, and modifier
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if [[ $expr =~ ^([0-9]+)?d([0-9]+)([+-][0-9]+)?$ ]]; then
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local num_dice=${BASH_REMATCH[1]:-1}
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local die_size=${BASH_REMATCH[2]}
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local modifier=${BASH_REMATCH[3]:-+0}
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local total=0
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local rolls=()
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# Roll each die
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for ((i=1; i<=num_dice; i++)); do
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local roll=$(roll_die $die_size)
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rolls+=($roll)
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total=$((total + roll))
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done
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# Apply modifier
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local mod_value=${modifier:1} # Remove +/- sign
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if [[ ${modifier:0:1} == "+" ]]; then
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total=$((total + mod_value))
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else
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total=$((total - mod_value))
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fi
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# Return results as JSON-like format
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echo "ROLLS:[${rolls[*]}]|MODIFIER:$modifier|TOTAL:$total|EXPR:$expr"
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else
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echo "ERROR: Invalid dice expression: $expr"
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exit 1
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fi
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}
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# Handle advantage/disadvantage (only for d20 rolls)
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if [[ $ADVANTAGE == true ]] || [[ $DISADVANTAGE == true ]]; then
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if [[ ! $DICE_EXPR =~ ^1?d20 ]]; then
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echo "ERROR: Advantage/Disadvantage only works with d20 rolls"
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exit 1
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fi
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# Roll twice
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result1=$(roll_dice_expr "$DICE_EXPR")
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result2=$(roll_dice_expr "$DICE_EXPR")
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total1=$(echo "$result1" | sed -n 's/.*TOTAL:\([0-9]*\).*/\1/p')
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total2=$(echo "$result2" | sed -n 's/.*TOTAL:\([0-9]*\).*/\1/p')
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rolls1=$(echo "$result1" | sed -n 's/.*ROLLS:\[\([^]]*\)\].*/\1/p')
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rolls2=$(echo "$result2" | sed -n 's/.*ROLLS:\[\([^]]*\)\].*/\1/p')
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if [[ $ADVANTAGE == true ]]; then
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if [[ $total1 -ge $total2 ]]; then
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final_total=$total1
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final_rolls=$rolls1
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dropped=$rolls2
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else
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final_total=$total2
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final_rolls=$rolls2
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dropped=$rolls1
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fi
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adv_label="ADVANTAGE"
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else
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if [[ $total1 -le $total2 ]]; then
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final_total=$total1
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final_rolls=$rolls1
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dropped=$rolls2
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else
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final_total=$total2
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final_rolls=$rolls2
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dropped=$rolls1
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fi
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adv_label="DISADVANTAGE"
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fi
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if [[ $HIDDEN == false ]]; then
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echo -e "${CYAN}🎲 Rolling with $adv_label${NC}"
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if [[ -n $LABEL ]]; then
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echo -e "${BLUE} $LABEL${NC}"
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fi
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echo -e " Roll 1: [$rolls1] = ${YELLOW}$total1${NC}"
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echo -e " Roll 2: [$rolls2] = ${YELLOW}$total2${NC}"
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echo -e " ${GREEN}Final Result: $final_total${NC} (dropped: $dropped)"
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fi
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# Output for parsing
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echo "FINAL:$final_total|EXPR:$DICE_EXPR|LABEL:$LABEL|ADV:$adv_label"
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else
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# Normal roll
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result=$(roll_dice_expr "$DICE_EXPR")
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if [[ $result == ERROR* ]]; then
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echo "$result"
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exit 1
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fi
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rolls=$(echo "$result" | sed -n 's/.*ROLLS:\[\([^]]*\)\].*/\1/p')
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modifier=$(echo "$result" | sed -n 's/.*MODIFIER:\([^|]*\).*/\1/p')
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total=$(echo "$result" | sed -n 's/.*TOTAL:\([0-9]*\).*/\1/p')
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if [[ $HIDDEN == false ]]; then
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echo -e "${CYAN}🎲 Rolling $DICE_EXPR${NC}"
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if [[ -n $LABEL ]]; then
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echo -e "${BLUE} $LABEL${NC}"
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fi
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echo -e " Dice: [${rolls// /, }]"
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if [[ $modifier != "+0" ]]; then
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echo -e " Modifier: $modifier"
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fi
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echo -e " ${GREEN}Total: $total${NC}"
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fi
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# Output for parsing
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echo "FINAL:$total|EXPR:$DICE_EXPR|LABEL:$LABEL|ROLLS:[$rolls]|MODIFIER:$modifier"
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fi
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exit 0
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